At rehearsal, the band became aware of a strange, thunder-like bass rumble in the middle of a song about an hour into the rehearsal. I found the noise was coming from one of my two cabinets: and when I reduced the amp master volume, it reduced the volume of the rumbling, so I unplugged that cabinet and continued the rehearsal with the other cabinet.
Back at home now, I’m thinking the problem could have been with the speaker cable or the amp, maybe.
Has anyone experienced a similar issue, and identified the cause?